摘要:
Methods and catalysts are provided for performing dewaxing of diesel boiling range fractions, such as trim dewaxing, that allow for production of diesel boiling range fuels with improved cold flow properties at desirable yields. In some aspects, the methods can include use of dewaxing catalysts based on an MEL framework structure (ZSM-11) to provide improved dewaxing activity. In some aspects improved dewaxing is achieved operating at lower pressures and with higher amounts of organic nitrogen slip from hydrotreatment.
摘要:
A process for producing light olefins and aromatics, which comprises reacting a feedstock by contacting with a catalytic cracking catalyst in at least two reaction zones, wherein the reaction temperature of at least one reaction zone among the reaction zones downstream of the first reaction zone is higher than that of the first reaction zone and its weight hourly space velocity is lower than that of the first reaction zone, separating the spent catalyst from the reaction product vapor, regenerating the separated spent catalyst and returning the regenerated catalyst to the reactor, and separating the reaction product vapor to obtain the desired products, light olefins and aromatics. This process produces maximum light olefins such as propylene, ethylene, etc from heavy feedstocks, wherein the yield of propylene exceeds 20% by weight, and produces aromatics such as toluene, xylene, etc at the same time.
摘要:
Methods are provided for hydroprocessing a feed (such as hydrotreating, hydrocracking, or hydrofining a feed) to generate a product with a reduced or minimized aromatics content relative to the severity of the hydroprocessing conditions. In some types of hydroprocessing applications, it can be desirable to select the severity of hydroprocessing conditions to achieve a desired level of removal for sulfur, a desired level for removal of nitrogen, and/or a desired level for increasing the viscosity index of a feed. The severity for heteroatom removal and/or viscosity index uplift can also correspond to an amount of conversion of a feed to lower boiling point products, so the lowest severity conditions suitable for achieving a product quality can be desirable. By improving the aromatics saturation during hydroprocessing, the severity of subsequent aromatics saturation processes can be reduced.
摘要:
The present invention relates to methods and systems useful for producing aromatics-rich products from liquid hydrocarbon condensates. The production system includes a hydroprocessing reactor, an aromatization reactor system and a hydrogen extraction unit. The methods for producing the aromatics-rich products include introducing a wide boiling range condensate into the hydroprocessing reactor and operating the aromatics production system such that the hydroprocessing reactor forms a naphtha boiling temperature range liquid product. The liquid hydrocarbons produced in accordance with the present invention may optionally be further processed using a hydrogen extraction unit to produce a high-purity hydrogen fraction.
摘要:
The aromatics production system is useful for producing an aromatics-rich system product from a liquid hydrocarbon condensate includes a hydroprocessing reactor, an aromatization reactor system and a hydrogen extraction unit. The method for producing the aromatics-rich system product from the wide boiling range condensate includes introducing the wide boiling range condensate into the hydroprocessing reactor, operating the aromatics production system such that the hydroprocessing reactor forms a naphtha boiling temperature range liquid product, such that the aromatization reactor system forms the aromatics-rich system product, and such that the hydrogen extraction unit forms a high-purity hydrogen.
摘要:
Methods are provided for producing fuel compositions. The methods comprise reacting a feedstock in the presence of a metathesis catalyst under conditions sufficient to form a metathesized product comprising olefins and esters. The methods further comprise hydrogenating the metathesized product form a fuel composition.
摘要:
A process (100) for obtaining olefins is proposed in which a first gas mixture (b), generated by a steam cracking process (1), is used at least partly to form a first separation feed (f) which comprises hydrocarbons having one to five carbon atoms, and from which at least a first separation product (g) and a second separation product (h, o) are produced, the first separation product (g) comprising at least the predominant fraction of the one- and two-carbon-atom hydrocarbons present in the first separation feed (f), and the second separation product (h, o) comprising at least the predominant fraction of the four- and five-carbon-atom hydrocarbons present in the first separation feed (f), and in which a second gas mixture (r), generated by an oxygenate-to-olefin process (2), is used at least partly to form a second separation feed (t) which comprises hydrocarbons having one to five carbon atoms, and from which at least a third separation product (e, y) and a fourth separation product (l, z) are produced, the third separation product (e, y) comprising at least the predominant fraction of the one- and two-carbon-atom hydrocarbons present in the second separation feed (t), and the fourth separation product (l, z) comprising at least the predominant fraction of the four- and five-carbon-atom hydrocarbons present in the second separation feed (t). The third separation product (e, y) is likewise used at least partly to form the first separation feed (f), and from at least part of the fourth (l, z) and second (h, o) separation products a third separation feed (h, l)(o, z) is formed and is subjected to a separation (14).
摘要:
Deep desulfurization of hydrocarbon feeds containing undesired organosulfur compounds to produce a hydrocarbon product having low levels of sulfur, i.e., 15 ppmw or less of sulfur, is achieved by first subjecting the entire feed to an extraction zone to separate an aromatic-rich fraction containing a substantial amount of the aromatic refractory and sterically hindered sulfur-containing compounds and an aromatic-lean fraction containing a substantial amount of the labile sulfur-containing compounds. The aromatic-rich fraction is contacted with isomerization catalyst, and the isomerized aromatic-rich fraction and the aromatic-lean fraction are combined and contacted with a hydrotreating catalyst in a hydrodesulfurization reaction zone operating under mild conditions to reduce the quantity of organosulfur compounds to an ultra-low level.